Question: did nelson rockefeller end his term in 1973-12-18?
Paraphrase: When did Nelson Rockefeller end his term?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q11237 p:P39 ?s . ?s ps:P39 ?obj . ?s pq:P582 ?x filter(contains(YEAR(?x),'1973')) }